21080155

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{307}}^1\times {\mathrm{443}}^1$

素因数の和:786

約数の個数: 16

約数和(自身を含む): 26256384

約数和(自身を除く): 5176229

約数列:

[1, 5, 31, 155, 307, 443, 1535, 2215, 9517, 13733, 47585, 68665, 136001, 680005, 4216031, 21080155]

約数ペア:

[(1, 21080155), (5, 4216031), (31, 680005), (155, 136001), (307, 68665), (443, 47585), (1535, 13733), (2215, 9517)]